28 November 2007 Michelson interferometer in a 2D photonic crystal utilizing self-collimation effect
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A Michelson interferometer (MI) constructed in a two-dimensional photonic crystal (2D PhC) utilizing self-collimation effect is proposed and investigated theoretically. The 2D PhC consists of a square lattice of air holes in silicon. It has square-shaped equal frequency contours (EFCs) in the frequency range of 0.26-0.275c/a for TE modes. The MI proposed consists of two PhC mirrors and one defect-row splitter. Light propagates between them employing self-collimation effect. The two interferometer branches have different path lengths L1 and L2. The FDTD calculation results show that the transmission spectrum from 0.26c/a to 0.275c/a at the MI output port is comb-shaped. The transmission peaks have a uniform spacing. Moreover, the peaks shift to the lower frequencies and the peak spacing decreases when the difference between L1 and L2 is increased. For the operating wavelength around 1550nm, the dimensions of this MI are only tens of microns. So this PhC Michelson interferometer may be applied in future photonic integrated circuits.
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Xiyao Chen, Xiyao Chen, Yishen Qiu, Yishen Qiu, Yufei Wang, Yufei Wang, Nan Lin, Nan Lin, Guimin Lin, Guimin Lin, Hailian Hong, Hailian Hong, Bo Ni, Bo Ni, "Michelson interferometer in a 2D photonic crystal utilizing self-collimation effect", Proc. SPIE 6834, Optical Design and Testing III, 68343I (28 November 2007); doi: 10.1117/12.757644; https://doi.org/10.1117/12.757644

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